byte[]与short、int、long、float、double的互换

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import java.util.Locale;

public class Tool {

/** 低位在前,byte转unsigned byte* */public static int byteToInt(byte b) {    return b & 0xFF;}/** 低位在前,bytes转short* */public static short byteArrayToShort(byte[] bytes, int startPos) {    if (bytes == null || startPos < 0) return 0;    short s = 0;    int b0 = byteToInt(bytes[startPos]);    int b1 = byteToInt(bytes[startPos + 1]);    s = (short) (b0 + (b1 << 8));    return s;}/** 低位在前,bytes转int* */public static int byteArrayToInt(byte[] bytes, int startPos) {    if (bytes == null || startPos < 0) return 0;    int i = 0;    for (int k = 0; k < 4; k++) {        i |= (byteToInt(bytes[startPos + k]) << (8 * k));    }    return i;}/** 低位在前，bytes转long* */public static long byteArrayToLong(byte[] bytes, int startPos) {    if (bytes == null || startPos < 0) return 0;    long l = 0;    for (int i = 0; i < 8; i++) {        l |= (long) ((bytes[i] & 0xFF) << (8 * i));    }    return l;}/** 低位在前,bytes转float* */public static float byteArrayToFloat(byte[] bytes, int startPos) {    if (bytes == null || startPos < 0) return 0;    float f = 0;    f = Float.intBitsToFloat(byteArrayToInt(bytes, startPos));    return f;}/*

* 低位在前,bytes转double
* */
public static double byteArrayToDouble(byte[] bytes, int startPos) {
if (bytes == null || startPos < 0) return 0;
long value = 0;
for (int i = 0; i < 8; i++) {
value |= ((long) (bytes[i] & 0xFF)) << (8 * i);
}
return Double.longBitsToDouble(value);
}

/* * short转bytes,bytes中高位在前 * */public static boolean shortToByteArray(short value, byte[] target, int startPos) {    if (target == null || startPos < 0) return false;    target[startPos] = (byte) (value >> 8);    target[startPos + 1] = (byte) value;    return true;}/* * int转bytes,bytes中高位在前 * */public static boolean intToByteArray(int value, byte[] target, int startPos) {    if (target == null || startPos < 0) return false;    target[startPos] = (byte) (value >> 24);    target[startPos + 1] = (byte) (value >> 16);    target[startPos + 2] = (byte) (value >> 8);    target[startPos + 3] = (byte) value;    return true;}/* * long转bytes,bytes中高位在前 * */public static boolean longToByteArray(long value, byte[] target, int startPos) {    if (target == null || startPos < 0) return false;    for (int i = 0; i < 8; i++) {        target[startPos + i] = (byte) (value >> (8 * (7 - i)));    }    return true;}/* * float转bytes,bytes中高位在前 * */public static boolean floatToByteArray(float value, byte[] target, int startPos) {    if (target == null || startPos < 0) return false;    int i = Float.floatToIntBits(value);    intToByteArray(i, target, startPos);    return true;}/** double转bytes,bytes中高位在前* */public static boolean doubleToByteArray(double value, byte[] target, int startPos) {    if (target == null || startPos < 0) return false;    long l = Double.doubleToLongBits(value);    longToByteArray(l, target, startPos);    return true;}

}

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